Eg, allow to split a 3840x2160 screen in 4 "virtual" 1920x1080 screens...
You could also use the Tiling module, but it is with non-enlightenment programs a pain.
You have to load it first under Settings -> Extensions -> Modules -> Core and load "tiling"
Then you get an Entry under Settings -> Windows called "Tiling" where you can enable tiling per virtual desktop
Then you have to set under Settings -> Input -> Keys the control keys you want to use. Then you can do something like this [warning, graphic hacker material!]
I have tried it. And first, I have tried to understand how it works... Maybe problem of french native language.
I am not sure to have well understood, but I do not think it is of easy use...